Nassau-Hadamar is the name of two side lines of the Ottonian main line of the House of Nassau. The older line of the counts of Nassau-Hadamar existed from 1303 to 1394; the younger line existed from 1607 to 1711 and received the hereditary title of prince in 1652.
After the death of Henry II the Rich of Nassau his sons, Walram II and Otto I shared the inheritance in 1255. The boundary between the two territories was formed approximately by the River Lahn. Walram took over the southern part of the realm (Walramic main line) and Otto, the northern part (Ottonian main line). The marriage between Otto and Agnes of Leiningen gave the Ottonian main line suzerainty over the March of Hadamar.
Otto's death in 1290 led to repeated inheritance disputes among his sons. In 1303, they shared his estate, under the mediation of John I of Limburg. The eldest son Henry took over the sub-county of Nassau-Siegen with its estate in the Siegerland and the Barony of Westerwald, the second son Emich/Emicho I inherited the sub-county of Nassau-Hadamar with Driedorf and Esterau, and the third son, John the sub-county of Nassau-Dillenburg with its estates around Dillenburg, Herborn, Mengerskirchen, the Calenberg Tithe and the jurisdiction (Gericht) of Heimau.
The County of Nassau was a German state within the Holy Roman Empire and later part of the German Confederation. Its ruling dynasty, the male line of which is now extinct, was the House of Nassau.
Diez an der Lahn is a town in Germany's Rhein-Lahn district in Rhineland-Palatinate, on the borders of Hesse. Diez is the administrative seat of the municipality of Diez.
The House of Nassau is a diversified aristocratic dynasty in Germania. It is named after the lordship associated with Nassau Castle, located in present-day Nassau, Rhineland-Palatinate, Germany. The lords of Nassau were originally titled "Count of Nassau", then elevated to the princely class as "Princely Counts". Early on they divided into two main branches: the elder (Walramian) branch, that gave rise to the German king Adolf, and the younger (Ottonian) branch, that gave rise to the Princes of Orange and the monarchs of the Netherlands.
Walram II of Nassau, German: Walram II. von Nassau, was Count of Nassau and is the ancestor of the Walramian branch of the House of Nassau.
Otto I of Nassau, German: Otto I. von Nassau was Count of Nassau and is the ancestor of the Ottonian branch of the House of Nassau.
Bad Marienberg (Westerwald) is a town in the Westerwaldkreis in Rhineland-Palatinate, Germany, and also the seat of the like-named Verbandsgemeinde, a kind of collective municipality.
Nassau-Siegen was a principality within the Holy Roman Empire that existed between 1303 and 1328, and again from 1606 to 1743. From 1626 to 1734, it was subdivided into Catholic and Protestant parts. Its capital was the city of Siegen, founded in 1224 and initially a condominium jointly owned by the archbishopric of Cologne and Nassau. It was located some 50 km east of Cologne, and it contained the modern localities of Freudenberg, Hilchenbach, Kreuztal, Siegen, and Wilnsdorf.
Waldbrunn (Westerwald) is a municipality in Limburg-Weilburg district in Hesse, Germany.
Count John I of Nassau-Siegen, German: Johann I. Graf von Nassau-Siegen, was since 1362 Count of Nassau-Siegen. He descended from the Ottonian Line of the House of Nassau.
Count Otto II of Nassau-Siegen, German: Otto II. Graf von Nassau-Siegen, was since 1343 Count of Nassau-Siegen. He descended from the Ottonian Line of the House of Nassau.
Henry I of Nassau-Siegen, German: Heinrich I. von Nassau-Siegen was Count of Nassau-Siegen, a part of the County of Nassau, and ancestor of the House of Nassau-Siegen. He comes from the Ottonian branch of the House of Nassau.
John Louis of Nassau-Hadamar, and also known in German as Johann Ludwig, was a German nobleman and member of the House of Nassau who is best known for his role as an aide to the head of the imperial delegation for the Peace of Westphalia, Count Maximilian von Trautmansdorff.
Christian, Prince of Nassau-Dillenburg was the last ruler of Nassau-Dillenburg from the line that had started in 1606 with George, Count of Nassau-Dillenburg.
Francis Alexander von Nassau-Hadamar was the last prince of Nassau-Hadamar.
Emicho I, Count of Nassau-Hadamar, was the second son of Count Otto I of Nassau and his wife Agnes, the daughter of Count Emich IV of Leiningen-Landeck. Emicho was the founder of the elder line of Nassau-Hadamar. He was a cousin of King Adolf of Germany. He and his brother Henry fought on Adolf's side in the Battle of Göllheim on 2 July 1298.
Maurice Henry, Prince of Nassau-Hadamar was — after his father — the second ruler of the younger Nassau-Hadamar line of the Ottonian branch of the House of Nassau.
John, Count of Nassau-Dillenburg was the third son of Count Otto I of Nassau and his wife Agnes, daughter of Count Emich IV of Leiningen-Landeck. John was a first cousin of King Adolf of the Romans.
Prima Divisio is the term used by historians for the Family Treaty from 1255 containing the first division of the county of Nassau between the brothers Walram II and Otto I.
Agnes of Leiningen was a Countess of Nassau by marriage to Otto I, Count of Nassau. She was probably Regent of the County of Nassau for some time for her youngest son after the death of her spouse in 1289/1290.
Countess Mary of Nassau-Siegen, German: Maria Gräfin von Nassau-Siegen, official titles: Gräfin zu Nassau, Vianden und Diez, Frau zu Breda, was a countess from the House of Nassau-Siegen, a cadet branch of the Ottonian Line of the House of Nassau, and through marriage Countess of Nassau-Wiesbaden-Idstein.